Fireproof door



April 30, 192.9- J. R. MCGRANIGHAN FIREPROOF DOOR 2 Sheets-Sheet.

Filed Jan. 13, 1928 Ap il 3 1 J. R.- MCGRANIGHAN FIREPROOF DOOR Filed Jan. 15, 1928 2 Sheets-Sheet 2 w m d w 91,!!! ,Illfllllflfllllll!!! Patented A r. 30, 1929.

UNITED STATES JOE-IN R. MCGRANIGHAN, OF PHILADELPHIA, PENNSYLVANIA.

FIBEIPROOF DOOR.

Application filed January 13, 1928. Serial No. 246,582.

The present invcntion relates to fire-proof or sheet metal doors, such as usedfor storerooms, and the like, and an object of the invention is the provision of a sheet metal door of simple and inexpensive construction, which will be substantialand capable of resisting fire.

Another object of the invention is the provision of a sheet metal door having its marginal portion of novel formation to fit or complement the door frame and to strengthen and reinforce the door.

With the foregoing and other objects in view, which will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts, as hereinafter described and claimed, it being understood that changes can be made within the scope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawings, wherein Figure 1 is a front view of the improved door.

Figs. 2 and 3 are enlarged vertical sections on the respective lines 2-2 and 33 of Fig. 1.

Fig. 4 is an enlarged horizontal section on the line 4-4 of Fig. 1.

Fig. 5 is a fragmentary plan view of the blank from which the door is made.

Fig. 6 is an enlarged perspective view of one upper corner portion of the door, with portions of the weld seam broken away.

Fig. 7 is an enlarged sectional detail on the line 77 of Fig. 1.

The door is formed from a sheet metal blank of suitable gage, and comprises the vrectangular plate 10 having the bent back portions 11 and 12 at its vertical edges and upper end, respectively. Said portions are bent back in rear of the plate 10, and the portions 11 extend from the lower to the upper end of the door, while the portion 12 is of less Width than the plate 10 so that its ends terminate short of the upper corners of the plate 10. The ends of the portion 12 are therefore presented to the edges of the portions 11. The portions 11 and 12 have rearwardly extending flanges or portions 13 and 14, respectively, arranged at right angles to the plate 10 and abutting at their ends, and said portions 13 and 14 have the inturned lips or secondary flanges 15 and 16, respectively which are overlapped at their ends, as seen in Fig. 6. The plate 10 is thusprovided with an integral frame portion in rear thereof along its vertical edges and upper end, to stifl'en and reinforce the door, and the portions 11 to 16, inclusive, are secured together by electric welding, as at 17, or the like, to provide a solid construction at the upper corners of the door.

Angle iron ribs 18 are riveted, welded or otherwise secured to the rear surface of the plate 10 at vertieallyspaced points and their ends abut the flanges 13 and are confined between the plate 10 and lips 15, thereby strengthening the door. One rib or angle iron .18 is at the lower end of the door.

Hinge straps 19 are riveted or otherwise se cured to the front surface of the plate 10 and are hingedly connected, as at 20, to one jamb of the door frame 21, which is composed of channel irons or other structural steel, and which is provided with anchors 22 to be embedded in the masonry, concrete or other wall structure.

Vertically spaced latches 23 are pivoted, as at 24, on the front side of the door and are adapted to engage in keepers .5 carried by the frame 21. Guide straps 26 are secured to the door and the latches move behind said straps, and a vertical bar 27 is pivotally connected with the latches 23 for simultaneously raising and lowering said latches.

In order to conveniently raise the latches a rock shaft 28 is journaled in the plate 10, one of the angle irons or ribs 18, and an angle bearing 29 secured to said rib 18, as seen in Fig. 7, and a cam or eccentric 30 is secured on said shaft below the intermediate latch 23. The shaft 28 has a handle 31 at'its forward end and a handle 32 at its rear end, in order that the'cam or eccentric 30 maybe turned from either side of the door to unlatch the door.

The door proper is composed of a single sheet metal blank having its vertical edge portions and upper end portion bent back and formed to extend within the door frame 21', and to strengthen the door, and the door proper includes the angle irons or ribs 18 disposed transversely or horizontally of the door and engaging the portions 13, 1 1, 15 and 16. The door is therefore of comparatively simple and inexpensive construction.

The flan es or portions 13 and 14 are also preferably welded at suitable intervals to the plate 10.

Having thus described the invention, What is claimed as new is l. A door comprising a sheet metal plate having bent back portions at its vertical edges and upper end flanges extending; from said bent back portions, and intnrned lips extending from said flanges, and metal ribs saeured to said plate and having their ends abutting; said flanges and confined between said plate and lips.

2. A door comprising a sheet i'i'ietal plate having bent back portions at opposite edgges flanges extending from said bent back portions, and intnrned lips extending from the flanges, and angle iron ribs secured to sald plate and having their ends confined between said plate and lips.

A door eoingrisin a sheet metal plate having; bent baex portions with flanges eK- tending; therefrom anr in'tnrned lips extend- "from said flanges, and metal stiiiening ribs secured to said plate and having their ends confined between said plate and lips.

in testimony whereoi I hereunto affix my signature.

JUHN 3t. lirloGRANlGHAN. 

